ferrichrysin

例句：

1. 1.The old iron gate is covered in athick layer of rust.
   那把旧铁门上覆盖着厚厚的一层锈。
2. 2. The car's engine was rusted beyond repair.
   这辆车的引擎已经锈得无法修复了。
3. 3. The metal surface is beginning to rustaway.
   金属表面开始生锈了。